What puts them at odds?Sebastian falls in love and develops a conscience – something that Kathryn cannot forgive.

We never meet the parents of these step-siblings, so we only speculate when we say that they must be awful, awful human beings. Their precocious offspring are so thoroughly corrupt, cynical and amoral that their progenitors must be something along the lines of Hannibal Lecter or there’s no explanation. One would be tempted to suggest that this pair deserve each other save for Sebastian’s redemption when he falls for the saintly (at least in comparison) Annette (Reese Witherspoon). And it’s really important to remember here that they’re step-siblings, not blood relations, otherwise the whole plot wherein Kathryn offers to sleep with Sebastian if he wins their bet goes from rather discomfiting to unbearably gross.